Projecting machine



July 17, 1928.

E. C. JENNER PROJECTI NG MACHINE Filed May 12, 1926 2 Sheets-Sheet l HINVENTOR A TTOR NE Y July 17, 1928. 1,677,237

E. c. JENNER PROJECTING MACHINE Filed May 12, 1926 2 Sheets-SheetINVENTOR fgber C. Jenner A IITOR NE Y Patented July 17, 1928.

UNITED STATES PATENT OFFICE.

PROJECTING MAGHIN E.

Application filed May 12,

My invention relates to projecting machines and more particularly tomeans for moving the film in a machine of this character intermittently.

It is the purpose of my invention to provide new and improved means forintermittently moving a film in a projecting machine and for holdingsaid film from movement.

It is a further purpose of my invention to provide driving means forintermittently moving the film comprising a motor, a reduc-- tiongearing and a shaft carried by the moto-r, said shaft having meansthereon for en. gagement with co-operating means that rotates a memberengaging with the film.

The driving means on the shaft is preferably provided .on both endsthereof so that the direction of movement of the film can be 2 reversedby inverting the motor in its support.

It is a further purpose of my invention to provide an intermittentdriving means for moving a film through a predetermined dis- 2 tance andthen halting the same for a definite period, comprising a rotatablemember engaging with the film having a toothed member thereon and adriving member carried' by a driven shaft that engages with the teeth ofsaid toothed member to rotate the same through a predetermined arc andwhich, furthermore, has means thereon for holding said toothed memberagainst rotation when said first-mentioned means is out of engagementtherewith.

Other objects and advantages of the invention will appear as thedescription of the accompanying drawings proceeds; however, I desire tohave it distinctly understood that I do not intend to limit myself tothe exact details shown or described but that'I intend to include aspart of my invention all such obvious changes and modifications of partsas would occur to a person skilled in this art and as would fall withinthe scope of the claims.

In the drawings,

Fig. 1 is a perspective view of my improved projecting machine, aportion of the cover being broken away.

Fig. 2 is a horizontal, sectional View, partly broken away, through thedriving means and the adjoining portion of the projecting machine.

1926., Serial No. 108,553.

Fig. 3 is a section taken on the line 33 of Fig. 2.

4 is an enlarged, sectional view of the driving means takensubstantially at right angles to Fig. 2, and

Fig. 5 is a perspective view of one of the bearing members for the driveshaft.

Referring in detail to the drawings:

My improved projecting machine cornprises a base portion 10, upon whichis mounted the usual projecting machine 11, which is provided With alens 12 through which the picture or other matter on the film 13 isprojected by means of a suitable lightmg apparatus in the machine 11.The film 13 used in conjunction with my invention is preferably acontinuous loop and extends over the rollers 14 and 15 mounted on thebrackets 16 and 17 and over the roller 18 mounted in the forward end ofthe base of the machine and a similar roller mounted at the rearthereof.

The film 13 is preferably divided into equal divisions 19, which maycontain any desired illustrations, such as advertising matter; eachsection being adapted to be placed in position in alignment with thelens 12 to project the same on a suitable screen or other surface, andsaid film is preferably provided with a plurality of openings 20therein, along the side edges thereof, there being a predeterminednumber of such openings for each section 19 of the film.

My invention comprises apparatus for intermittently moving the film 13so that a section 19 isplaced in alignment with the lens 12 and ismaintained in such position for a predetermined period of time, afterwhich the same is moved away and the succeeding section is quickly movedinto position to remain in position in alignment with the lens 12 forthe same period of time.

In order to accomplish this, the rotatable members 21 are mounted on theshaft 22,

which is mounted in suitable hearings in the frame members 23 and 24;said rotatable members 21 being provided with projections 25 that areadapted to enter the openings 20 in the side edges of the film 13. Inorder to hold the film in proper engagement with the rotatable members21 so that the projections 25 will mesh with the openings 20, a

retaining member 26 is provided, which is pivoted at 27 on the framemember 24 and is provided with a spring 28 urging the member 26 intoengagement with the film and toward the rotatable member 21. Pairedfingers 29 are provided on opposite sides of -the member 26,- betweenwhich the projections are adapted to pass.

The base member 10 is provided with a bers 35. The motor 31 is providedwith a.

r duction gear housing 36, into which the motor shaft 37 extends; saidmotor shaft being provided with a \VOI'IIL 38 that meshes with the wormwheel 39, which is mounted on a shaft 40, supported by the oppositeWalls of the housing 36 and provided with a worm 41 that meshes with aworm wheel 42, provided on the shaft 43.

The housing 36 is provided with an elongated bearing 44 for the shaft 43and with a detachable cover plate 45, which is provided With a similarelongated bearing 46 for the shaft 43. Collars 47 and 48 are mountedrespectively between the closed end wall of the housing 36 and theinwardly projecting hub 49 on the cover plate 45, the cover plate beingheld in posit-ion by any suitable means such as screws 50.

The shaft 43 has secured to opposite ends thereof so as to rotatetherewith the camshaped plates 51 and 51 which are provided with theprojections 52 and 52 respectively on the elongated ends 53 thereof.Projecting from the outer faces of the plates 51 and 51 are the stopmembers 54 and 54. Said stop members are shown asbeing made of separateplate-like members, which are pro- -vided with convexly curved edgeportions 'or 51 is a 55, which are curved on the axis of the shaft 43and with concave cut-out portions 56',

which lie on the same side of the shaft 43 as the pins 52 and 52. Whilethe members 54 and 54 are shown in the drawings as being 'made of aseparate piece of material, this is immaterial as long as a convexshoulder is provided at and a concave shoulder at 56. The parts areshown as being held in posit-ion on the shaft 43 by means of the rivets57.

Co-operating with either the members 51 toothed member 58, which ismounted on the shaft 22, so as to rotate therewith; being-held inposition by means of the collar 59. The toothed member 58 is providedwith a plurality of substantially radially extendin slots 60, whichdefine the teeth 61, said teet being provided with con cave outer edges62 and which have relatively sharply curved portions 63 merging withsaid concave portions 62 and with the walls of the slots 60. The innerends of the slots are preferably curved, as shown at 64. The curvatureof the concave edges 62 is substantially on the same radius as that ofthe convex shoulder 55 on the members 51 and 51.

In the drawings the member 51 is shown as being in engagement with thetoothed members 58. This is the usual arrangement but if it is desiredto drive the film 13 in the opposite direction by means of the motor 31,this can be done by removing the strap 32' and turning the motor upsidedown when the member 51 will engage with the toothed member 58.

The members 51 and 51' operate in the same way; the operatiOn of themember 51 being only described as the operation of both members would besubstantially identical.

When the pin 52 engages with a slot 60, it rotates the member 58 througha predetermined arc, rotating the shaft 22 through a predetermined arcand also the rotatable members 21, thus advancing the film apredetermined distance; the number of projections 25 on the members 21and the number of openings 20 to each section of the film being soproportioned that each arcuate movement of the toothed member 58 willadvance the film 13 through the length of one section 19. As the pin orprojection 52 leaves the slot 60, the convex shoulder 55 on the member53 engages with the concave outer edge 62 of the tooth 61, following thepin 52, and locks the member 58 against rotation; this condition beingmaintained until the pin 52 has made a complete turn around the axis ofthe shaft 43 and moves into engagement with the next slot 60. When thisoccurs, thecut-out concave portion 56 of the member 53 is opposite theconcave portion 62 of the tooth, thus permitting the toothed member 58to rotate, due to engagement of the pin 52 in the slot 60. This isrepeated for each slot 60, the sections of the film thus remaining inposition tobe projected by the machine for a relatively long period oftime while the time used for moving one section away and bringing thenext section in position is relatively quite short. The shaft 43obviously operates slowly because of the reduction gearing comprisingthe two worms and the two worm wheels.

The member 26 may be provided with a handle 65 for moving the same outof engagement with the film 13. The shaft 22 is preferably held inposition by means of the nut 66 en aging with the screw-threaded outerend t ereof and the spacing collars 67 are preferably provided betweenthe wall 24 and the toothed wheel 58. A. suitable cover member 68 may beprovided for the machine, which may have a hinged front wall portion 69.

The shaft 40 is provided with an adjustable bearing member 70, which ismade in the form of a screw-threaded plug engaging in a screw-threadedopening 71 in the bottom wall of the housing 36.

What I claim and desire to secure by Letters Patent is:

1. In a projector, means for advancing a film comprising a motor, amotor support, reduction gearing and shaft carried by said motor. adriving member on each end of said shaft, a film-engaging member, and amember rotating therewith and engagcable With either of said drivingmembers, whereby said motor may be inverted in its support to reversathe direction of movement of said film.

2. In a projector, means for advancing a film comprising a motor, amotor support, reduction gearing and a shaft carried by said motor, adriving member on each end of said shaft. 21 film-engaging member, and atoothed member rotating, therewith and engageable with either of saiddriving members, whereby said motor may be inverted in its support toreverse the direction of movement of said film, said driving memberscomprising means engaging the teeth on said toothed member to rotatesaid toothed member through a predetermined arc, and means engaging saidtoothed member to hold the same stationary when said first means isdisengaged therefrom.

In testimony whereof I afiix my signature.

EGBERT C. JENNER.

